[Maverick Meerkat] Can't adjust brightness in VAIO VPCCW15FL

[David Reza]

Binary package hint: acpi-support

I have Ubuntu 10.10 installed in a Sony VAIO CW15 (VPCCW15FL) with privative NVidia drivers 260.19.36 downloaded from Nvidia.com. Compiz and animations work perfectly.

When Fn+brightness keys are pressed (Fn+F5, Fn+F6) Ubuntu shows up the graphic sliders meaning that brightness has been increased or decreased, but actually the brightness it is NOT modified at all, keeping it at maximum.

The nvidia driver has been set correctly in /etc/X11/xorg.conf. I can use the NVIDIA X Server Settings correctly.

I have the next files:

* /proc/acpi/video/NGFX/LCD/brightness with the line:
              <not supported>

      Same for /proc/acpi/video/NGFX/HDMI/brightness and /proc/acpi/video/NGFX/CRT/brightness.

* Files on /usr/share/acpi-support making reference to some files of /var/lib/acpi-support. But this last path has NO files, neither hidden.

* The next files on /sys/class/backlight/sony

              + power [ folder ]
              + subsystem [ link to one folder back: /sys/class/backlight/ ]
              + actual_brightness
              + bl_power
              + brightness
              + max_brigthness
              + uevent (empty file)

     with the 'brightness' and 'actual_brightness' files getting modified when pressing Fn+F5 or Fn+F6 keys.

* /var/log/Xorg.0.log (attached) with this special lines:

              [ 37.529] (WW) NVIDIA(0): ACPI: Error: Unable to find the brightness file path under
              [ 37.529] (WW) NVIDIA(0): /proc/acpi/video. The NVIDIA X driver will not be able to
              [ 37.529] (WW) NVIDIA(0): respond to ACPI brightness change hotkey events.

* Output of `dmesg' command (attached in case it could be useful)

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu3
ProcVersionSignature: Ubuntu 2.6.35-25.44-generic-pae 2.6.35.10
Uname: Linux 2.6.35-25-generic-pae i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module 260.19.36 Tue Jan 18 17:10:40 PST 2011
 GCC version: gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)
Architecture: i386
Date: Sun Mar 13 19:35:10 2011
DkmsStatus:
 vboxhost, 4.0.4, 2.6.35-25-generic-tuxonice, i686: built
 vboxhost, 4.0.4, 2.6.35-25-generic-pae, i686: installed
 vboxhost, 4.0.4, 2.6.35-27-generic-pae, i686: built
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MachineType: Sony Corporation VPCCW15FL
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-25-generic-pae root=UUID=717c9552-edd1-4682-a12e-2079273ff453 ro acpi_osi=Linux quiet splash
ProcEnviron:
 LANG=es_MX.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 09/22/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R0190Y5
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR0190Y5:bd09/22/2009:svnSonyCorporation:pnVPCCW15FL:pvrC602QRN2:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VPCCW15FL
dmi.product.version: C602QRN2
dmi.sys.vendor: Sony Corporation
system:
 distro: Ubuntu
 codename: maverick
 architecture: i686
 kernel: 2.6.35-25-generic-pae

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.